Further update. I gave the iso valves one more go last night so turned them both 1/4 turn and also shut down the iso valve on the incoming mains feed.
This time, the pressure held at 2 bar. I then opened the iso valve for the incoming feed and left it for a few hours, and the pressure stayed at 2.
So I guess I do have temperamental return/flow iso valves - either that or the BG engineer managed to fix them while capping off the boiler. Who knows - what I do know if that I have a leak somewhere. We ran a test today and drained the system until the pressure dropped from 2 to 1 bar (i.e. approx 1 day of pressure loss). Over 5 litres of water - I can't believe we can't hear it, it must be virtually gushing!
So we've got a heck of a lot of water leaking somewhere, so it's either ground floor over crawl space, or in a wall somewhere. I've just capped off the kitchen-diner, so will see what happens tomorrow.
Whitespirit66 - no pressure tester, but basically if after I've capped off the two different 'inaccessible' rooms on the ground floor and no joy, I'll probably get professional help.
This time, the pressure held at 2 bar. I then opened the iso valve for the incoming feed and left it for a few hours, and the pressure stayed at 2.
So I guess I do have temperamental return/flow iso valves - either that or the BG engineer managed to fix them while capping off the boiler. Who knows - what I do know if that I have a leak somewhere. We ran a test today and drained the system until the pressure dropped from 2 to 1 bar (i.e. approx 1 day of pressure loss). Over 5 litres of water - I can't believe we can't hear it, it must be virtually gushing!
So we've got a heck of a lot of water leaking somewhere, so it's either ground floor over crawl space, or in a wall somewhere. I've just capped off the kitchen-diner, so will see what happens tomorrow.
Whitespirit66 - no pressure tester, but basically if after I've capped off the two different 'inaccessible' rooms on the ground floor and no joy, I'll probably get professional help.
